If a ∈ {x ᦇ 178; - 2x + a = 0, X ∈ r} find the set of values of real number a

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• 1. (very simple basic problem) urgent Let x ~ n (5,4), find a such that P {x}
• 2. Given that vectors a and B satisfy the absolute value (a-b) = 1 and B = (3,4), the value range of absolute value a is to seek the help of the great God
• 3. As shown in Fig. 1, in RT △ ABC, ∠ ACB = 90 °, point 0 is the midpoint of BC, D is the upper moving point of AB, extend do to e, and OE = OD, connect CE (1) As shown in Figure 2, if D is the midpoint of AB, please judge the shape of quadrilateral EDAC and explain the reason; (2) as shown in Figure 3, if ∠ a = 60 ° and ∠ BOD = 30 °, is quadrilateral EDAC isosceles trapezoid? Please explain the reason; (3) if AC = 15, ab = 25, please make the location of point D in Figure 4 to minimize the perimeter of the quadrilateral EDAC, please complete the figure and find out the minimum perimeter of the quadrilateral EDAC
• 4. If the derivative value of the function y = x ^ 4 + ax ^ 2-4 / 3A at x = a is 0, what is the constant a
• 5. First simplify, then evaluate: (xy-3x ^ 2) - 2 (xy-2x ^ 2-1), where x and y satisfy the condition x + 2 + (Y-1) ^ 2 = 0
• 6. Solving equations 2A + B = 7 2a-b = 1
• 7. If the slope of an asymptote of the hyperbola whose center is at the origin and focus is on the coordinate axis is 2 / 7, the eccentricity of the hypohyperbola can be calculated
• 8. Write a program, (C language) to find the root of the quadratic equation AX + BX + C = 0
• 9. Use the image of quadratic function to find the square of the approximate root X of the following equation + 5x-3 = 0
• 10. Using trapezoidal method to calculate the approximate value of definite integral (accurate to 0.0001)
• 11. How to judge whether a function is symmetrical about the origin (except drawing images)
• 12. If the function f (x) = x ^ 3-3x ^ 2 + 3x + 1, the center of symmetry of the image is
• 13. It is known that the image of function f (x) and the image of function H (x) = 1 / 3x ^ 3 + x ^ 2 + 2 are symmetric with respect to a (0,1) (1) Find the analytic expression of F (x); (2) If G (x) = f (x) + ax, and G (x) is an increasing function on (- ∞, + ∞), find the value range of real number a~ Mathematics is not very good. In fact, the first problem is how to find the symmetry of cubic function,
• 14. Given that the solution of the system of equations 2x + 5Y = 7, ax + 4Y = 6 is a solution of the equation x + y = 12, find the value of A
• 15. If the solution of the system of equations {x + y = 8m, X-Y = 2m satisfies 2x-5y = 1, the value of M is obtained
• 16. It is known that y is the inverse proportional function of X, and when x = - 2, y = - 5, the expression of this function and the value range of the independent variable X are obtained
• 17. Why is x an independent variable and y a dependent variable in a function Why can't we say that x is a dependent variable and Y is an independent variable
• 18. It is said in the book that y = f (x), X is an independent variable and Y is a dependent variable. If the function is written as y = 5x + 2, then the independent variable is x and the dependent variable is y. if it is written as x = 1 ^ 5y-2 ^ 5, then y is the independent variable and X is the dependent variable?
• 19. Sometimes the independent variable is X. when the independent variable becomes a formula containing x, how does its definition range change? Please give a specific explanation and the transformation of its image. I'm not sure if I can help you
• 20. In the equation 3x-5y = 15, when x = 0, y = ()